Apropos case sensitive?

Sorry if this has already been decided, but I've been using
lucid, which has a case-sensitive apropos, and think it's
*the wrong thing*.
It's easy to write a case-sensitive apropos using a case-sensitive one,
but to do the reverse you're effectively rewriting apropos.
What if some mad C hacker was writing code for you?
"Oh yeah, apropos foo."
Did he mean FOO, Foo, or foo? Or maybe (gasp) fOO?
-- STeVe